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How do you evaluate a ranking or recommendation system (nDCG, MAP, MRR, recall@k)?

Ranking is not classification, so accuracy is the wrong tool. The signal is matching the rank-aware metric to the task: one right answer versus many, binary versus graded relevance. Here is the answer.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Ranking is not classification, so accuracy is the wrong tool. The signal is matching the rank-aware metric to the task: one right answer versus many, binary versus graded relevance. Here is the answer.

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